pan/lower_blend: Inline a variable

Useless comment.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
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  Sanity
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sanity

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  Container
manual #9417291
aarch64 manual
arm_build
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windows shell 1809 mesa manual
windows_build_vs2019
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manual
x86_build-base
manual #9417290
manual
x86_test-base
 
  Container 2
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android_build
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i386_build
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kernel+rootfs_amd64
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aarch64
kernel+rootfs_arm64
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aarch64
kernel+rootfs_armhf
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ppc64el_build
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s390x_build
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x86_build
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x86_test-gl
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x86_test-vk
 
  Meson X86 64
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meson-clang
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meson-clover
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meson-clover-testing
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meson-gallium
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meson-release
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meson-testing
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meson-testing-asan
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meson-vulkan
 
  Build Misc
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arm_test
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meson-android
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aarch64
meson-arm64
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aarch64
meson-arm64-asan
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aarch64
meson-arm64-build-test
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aarch64
meson-armhf
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meson-i386
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meson-mingw32-x86_64
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meson-ppc64el
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kvm
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  Intel
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mesa-ci-aarch64-lava-collabora manual
iris-amly-traces:amd64
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mesa-ci-aarch64-lava-collabora manual
iris-apl-traces:amd64
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mesa-ci-aarch64-lava-collabora manual
iris-glk-traces:amd64
 
  Arm
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mesa-ci-aarch64-lava-collabora
panfrost-g52-gles2:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-g52-gles31:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-g52-gles3:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-t720-gles2:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-t760-gles2:armhf
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mesa-ci-aarch64-lava-collabora
panfrost-t760-traces:armhf
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mesa-ci-aarch64-lava-collabora
panfrost-t860-gles2:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-t860-gles31:arm64
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mesa-ci-aarch64-lava-collabora
panfrost-t860-gles3:arm64 1/2
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mesa-ci-aarch64-lava-collabora
panfrost-t860-gles3:arm64 2/2
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mesa-ci-aarch64-lava-collabora
panfrost-t860-traces:arm64